Electric lamp



Aug. 26 1924.` l 1,506,183-

L. KELLNER ELECTRIC LAMP Filed Nov. 2.9. 1921 5 vwantoz Patented Aug. 26, 1924.

UNITED STATES` LOUIS KELLNER, 0F BROOKLYN, NEW YORK.

ELECTRIC LAMP.

Application led November 29, 1921. Serial No. 518,715.

To all whom it may concern:

Be it known that I, Louis KELLNER, a citizen of the United States, and resident of the borough of Brooklyn, county of Kings city and State of New York, have invented certainnew and useful Improvements in Electric Lamps, of which the following is a specification.

This invention relates tov means for pre venting unauthorized removal of electric lamps, screw plug connectors and similar devices, from their threaded sockets or receptacles. The ordinary electric incandescent lamp is provided with a threaded base or plug which engages a correspondingly threaded metal shell in a socket or receptacle, and various other forms-of electrical connectors are similarly equipped with threaded bases for the purpose of securing them in threaded sockets. This invention is applicable to all of these devices, and while I have illustrated it as applied to incandescent lamps, it will, of course, be understood that it may be applied to the other forms of screw connectors.

Electric incandescent lamp bulbs are f requently stolen because they may be readily removed from their sockets by merely unscrewing them. The purpose of this invention, as applied to lamps of this character, 1s to provide means whereby the lamp may be threaded into the ordinary lamp socket, but which when in lace cannot be readily removed without tlie insertion of the properly shaped key.

The main object of this invention is to provide a device of the character described which shall be simple to manufacture, but which is effective in operation, and which will not require any change in the ordinary standard lamp socket.

In the drawing, Fig. 1 is a side elevation of an incandescent lamp bulb partly in sec tion and showing the invention applied thereto;

Fig. 2 a side elevation of the threaded connector sleeve;

Fig. 3 a similar view of the insulating guard flange; and

Fig. 4 a detail perspective view of the key designed to connect the connector sleeve to the lamp bulb,

Referring to the various parts by numerals, l designates the lamp bulb. To the reduced terminal end of the bulb is rigidly connected the usual insulating plug exten sion 2 throu h which the terminal wires extend. On t e outer end of the plug extension is rigidly mounted a contact plate 3 to which one terminal wire 4 is connected. Surrounding the plug extension 2 is a eylindrical metal terminal shell 5; and to this shell one end of the terminal wire 6 is connected.- One end of the terminal shell is slightly enlarged to receive the reduced terminal end of the bulb, and the shell is secured to the plug extension and to the bulb by suitable cement. The free end of the terminal shell 5 is bent outwardly to form the annular radial flange 7, said flange being at the free end of t-he plug extension and near the contact 3.

Surrounding the terminal shell and loosely rotatable thereon is a threaded connector sleeve 8; one end of said sleeve being close to the flange 7 and the other engaging or fitting closely to the enlarged end of the terminal shell. The sleeve 8 is externally threaded and is of standard size to adapt it to be screwed into the internally threaded standard lamp socket. The end of the connector sleeve adjacent the lamp bulb is formed with a cylindrical or unthreaded part 9; and between the flange 7 and the adjacent end of the sleeve 8 is arranged a loose ring or washer 10. Secured to the lamp body and the enlarged end of the terminal sleeve is a guard flange 11 of insulating material, said flange surrounding and enclosing the cylindrical extension of the connector sleeve. The guard flange is so located that there is a very slight longitudinal play between the threaded connector sleeve, the washer 10 and the guard flange; and the connector sleeve is so arranged that there will at all times be an electrical contact between it and the terminal shell 5.

In the guard flan e a C-shape opening 12 is formed; and in t e cylindrical extension of the connector sleeve a similar opening 13 is formed. By rotating the lamp plug and the guard flange with respect to the connector sleeve, these two C-shape open ings maybe brought into register, anda connectorkey 14 may then be inserted l through the guard lian e and the connector sleeve to thereby lock t e sleeve to the lamp lbulb so that by turning the lamp bulb it an ordinary standard lamp socket, the key 'is screwed home and its ycontacts are in engagement with the usual contacts of the 14 is passed through the registering openings in the guard flange-and the connector sleeve. This locks the sleeve, to the lamp bulb and the lamp may be threaded into its socket in the usual way. When` the lamp socket the key may be removed. This' frees the connector sleeve and the lamp may then be turned freely without unscrewing the connector sleeve from the socket. yIn order to remove the lamp from` its socket, the openings in the'guard flangia and the connector sleeve must be broug t into register and then the key 14 inserted. The purpose of securing an insulating finger piece to the key is to rom rerevent the operator ceiving the electric current. from nector sleeve. It is manifest that if it be attempted to connect the connector sleeve with the guard flange by inserting a small piece of metal, .a piece of wire or a pin, the operator will receive the current from the lam circuit. y

\ T e purpose of the washer 10 is to prevent any possibility of the friction between the end of the connector sleeve and the retaining flange 7 bein suicient to lock theconnector sleeve to tie plug. The guard flangev 11 prevents access to the connector sleeve when the lamp is screwed in its socket and also prevents any accidental lcontactgwith the extension of the connector sleeve when manipulating the lamp either to. insert it or withdraw it from its socket.

What I claim is; A

1. A11 incandescent electric lamp comprising `a bulb, an extension' ofinsulation secured to the terminal end of said bulb, a terminal extending through said insulation a contact on the endof the insulation an connected to the terminal, a cylindrical terminal shell surrounding the said extension and rigidly connected thereto, a terminal wire connected to said shell a threaded sleeve loosely surrounding and rotatable on the terminal shell and in electrical contact therewith, means at the outer free end ofA the terminal shell to retain the threaded sleeve in position, an insulatin rin car@ ried by the lamp and enclosing t e a ]acent end ofthe threaded sleeve, and removable.

means for connecting the threaded sleeveto the lamp to turn therewith.A

2.An electric lamp comprising a bulb, a

the conloosely rotatable threaded sleeve of conducting material mounted on the terminal end thereof and adapted to screw into a lamp socket,'a ring of insulating material secured to the lamp and fitting over the end of the sleeve adjacent the lamp bulb, means for temporarily locking the sleeve to the lamp to turn therewith, and contacts carried by the lamp. l

3. An electric lamp comprising a bulb, a loosely rotatable threaded connector sleeve. of conducting material mounted on the terminal end thereof and adapted to screw into a lamp socket, a guard flange of insulating materlal secured to the lamp and fitting over the end of the connector sleeve adja-.r` cent the lamp bulb, and removable means adapted to be inserted through the insulat?` mg guard flange andthe connector sleeve for temporarily locking the sleeve to the\85 lam rie by the lamp and adapted to engage contacts in thelamp socket.

4. An electric connector adapted to fit a threaded socket and comprising a rigid plug carrying two terminal wires, a loosely roducting material mounted on said lug and adapted. to screw into a threaded) socket,

a` guard flange carried by the connector and` is in place in its socket, and a removable means adapted to be inserted through the guard llange and the connector sleeve to temporarily lock the sleeve to the lamp to turn therewith.

to turn therewith, and contacts car- -tatable threaded connector sleeve of lcon-- es I guard flange fitting 5. 'An electric connector adapted to lit ai.

threaded socket and comprising a rigid plug carr ing two terminal wires, aloosely rotata le vthreaded connector sleeve of con.-

ducting material mounted on said pl and adapted to screw into a threaded soc t, aguard ange of insulating material carried the connector and rotatable with the plu relatively to the connector sleeve said guar flange fitting ov'er and enclosing'the adjacent en d of the connector sleeve and serving as a cover and protector vfor said sleeve when the 'connector is in place in its socket, the guard flange and the enclosed end of 'the connector sleeve being formed with` open-v ings adapted to be brought into re r, and a removable key adapted to passed through said openings to temporarily lock the connector sleeve to the guard flange.

6. An electric connector adapted to t a threadedsocket and comprising a rigid plug carrying two terminal wires, a loosely ro-l tatable threaded connector' sleeve of conf ductitne material mounted on said pl and yadapl to yscrew into a threaded al guard flange of insulating material carried ings adapted to be brought into register, a l0 y the connector and rotatable with the plu f removable key adapted to be passed through relatively to the connector sleeve said guard said openings to temporarily lock the conflange fitting over and enclosing the adj anector sleeve to the guard flange, and an incent end of the connector sleeve and serving sulating finger piece secured to said key.

as a cover and protector for said sleeve when In testimony whereof I hereunto aiiix my 15 the connector 1s in place in its socket, the signature. guard ange and the enclosed end of the connector sleeve being formed with open- LOUIS KELLNER. 

